As I drive up to ten different customers' cars a day I would say the most popular make is Nextbase. Whether they are any good or not is not for me to say as company policy is that we ask for their removal or being switched off.
5 years ago when looking for a new car I was disappointed to find out that although many had cameras for manoeuvres (eg parking) none could record. Hopefully next time I buy a new car that will have changed.
I've never had one complain but some are hard wired so they stay on. The screens are masked off so they don't record in the workshop. I have no problem with them being there but the company claims privacy and GDPR etc.
As I drive up to ten different customers' cars a day I would say the most popular make is Nextbase. Whether they are any good or not is not for me to say as company policy is that we ask for their removal or being switched off.